DP Biology (first assessment 2025)

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Question 22N.1A.SL.TZ0.15

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.15
Level SL Paper 1A Time zone TZ0
Command term Question number 15 Adapted from N/A
15.
[Maximum mark: 1]
22N.1A.SL.TZ0.15

A couple have four children whose blood groups are A, B and AB. What is the likely combination of the parents’ genotypes?

A.  IAi and IBi

B.  IAi and IBIB

C.  IAIB and ii

D.  IAIA and IBIB

[1]

Markscheme

A

Examiners report

The candidates were asked to identify the likely combination of the parents' genotypes given the blood groups of their four children. Once centre queried the lack of any children with blood group O. However, four children do not represent a statistically significant sample and it is very likely that one of the possible blood groups is not present. The question was answered correctly by 61 % of the students and was a good discriminator.

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